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dc.contributor.authorSagués i Mestre, Francesccat
dc.description.abstractWe study the erratic displacement of spiral waves forced to move in a medium with random spatiotemporal excitability. Analytical work and numerical simulations are performed in relation to a kinematic scheme, assumed to describe the autowave dynamics for weakly excitable systems. Under such an approach, the Brownian character of this motion is proved and the corresponding dispersion coefficient is evaluated. This quantity shows a nontrivial dependence on the temporal and spatial correlation parameters of the external fluctuations. In particular, a resonantlike behavior is neatly evidenced in terms of the noise correlation time for the particular situation of spatially uniform fluctuations. Actually, this case turns out to be, to a large extent, exactly solvable, whereas a pair of dispersion mechanisms are discussed qualitatively and quantitatively to explain the results for the more general scenario of spatiotemporal disorder.eng
dc.format.extent12 p.-
dc.publisherThe American Physical Societyeng
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofPhysical Review E, 2001, vol. 63, núm. 4, p. 046205-1-046205-12-
dc.rights(c) American Physical Society, 2001-
dc.subject.classificationQuímica físicacat
dc.subject.classificationFísica estadísticacat
dc.subject.otherPhysical chemistryeng
dc.subject.otherStatistical physicseng
dc.titleNoise-induced Brownian motion of spiral waveseng
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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